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Thread: Sand Filter and Backwashing - some sand comes out.

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    Sand Filter and Backwashing - some sand comes out.

    Hi all TFP friends! I've visited this site very often and was convinced on buying a sand filter for my pool based on the forums here. Yes I have one of the lovely Intex pools and of course the filter that came with it was way way under sized and well just didn't work well.

    So here is the question as I'm a new to posting. Just setup my filter today and got to the part where I backwash the sand before starting to filter. The directions said to make sure the sediment glass was clear. I backed washed for 4 minutes and the water is clear but there is some sand in the glass so I decided to put a bucket at the end of the hose and there is a very little sand that comes out. Thinking about it I think it is ok since I'm backwashing and the sand gets a little stirred up so you might lose some. I just want to make sure this is normal as I'm not really wanting to put it on filter and have sand in my pool.

    The sand I used is Aqua Quartz from a local pool store.

    Thanks for any help!
    Dan
    The Woodlands, TX
    approx 40,000 gal
    IG, plaster
    cartridge filter, SWCG

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    Re: Sand Filter and Backwashing - some sand comes out.

    Do you have a multi-port valve that gives you a "rinse" position?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Sand Filter and Backwashing - some sand comes out.

    yes, I did rinse it for about 2-3 minutes and then backwashed again. I repeaded the process a couple of times; still a little sand still come out of the backwash.
    The Woodlands, TX
    approx 40,000 gal
    IG, plaster
    cartridge filter, SWCG

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    Re: Sand Filter and Backwashing - some sand comes out.

    But did it come out during the rinse? Losing a little sand during backwash is perfectly normal...not so on rinse or filter.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Sand Filter and Backwashing - some sand comes out.

    hmm not sure I completely understand. For rinse I'm support to put a cap on the disposal side of the filter so I'm not draining it to see any sand . Should I not be doing that?

    I'm knocking on wood here but I thought I would put an old sock over the jet into the pool to catch any sand or at least see if any sand is passing. I ran the pump for a minute or two and so far I see no sand in the sock. I also rinsed the sock into a dark bucket. I know...a little paranoid as I just filled the pool for the year and would really hate to figure out how to get the sand out of the pool.
    The Woodlands, TX
    approx 40,000 gal
    IG, plaster
    cartridge filter, SWCG

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    linen's Avatar
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    Twin Cities, MN
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    Re: Sand Filter and Backwashing - some sand comes out.

    What is the make and model of your sand filter? Or post a pic.

    Most multiport valves rinse setting just bypasses the sand and allows flow right to the waste port. The purpose is the rinse any stuff stuck in the valve assembly from being sent back to the pool. Usually no "caps" to mess with.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Sand Filter and Backwashing - some sand comes out.

    Even if you can't figure it out, manually vacuuming a little sand back into your filter is painless.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Sand Filter and Backwashing - some sand comes out.

    It is an Intex 1600 GPH Sand Filter & Salt Water System.
    The Woodlands, TX
    approx 40,000 gal
    IG, plaster
    cartridge filter, SWCG

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